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Hyperoxia Tests
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1. Indications:
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1.1 Hyperoxygenation in a newborn is one diagnostic test that is helpful
when cyanotic
congenital heart disease is suspected.
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2. Equipment needed:
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2.1 TcPO2 monitor
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2.2 100% oxygen source (blender not acceptable)
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2.3. Oxygen mask with oxygen connecting tubing
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3. Procedure:
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3.1. Apply TcPO2 electrode to infant in Room Air in a
post ductal position
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3.2. After stabilization of the TCOM:
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3.2.1 place O2 mask on infant insuring adequate 100% O2 flow.
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Point of Emphasis: 10-15 minutes is usually sufficient for equilibration
after application.
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3.2.2 Apply 100% for approximately 10 minutes.
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3.2.3 Note response to 100% oxygen on TcPO2 monitor.
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Point of Emphasis: PaO2 of less than 100 mmHg in an adequately ventilated
infant
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rules out significant cyanotic heart disease and ductal shunting.
Watch for tc >
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300mmHg
Reference: JPN Manual of Neonatal Care
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Pre & Post Ductal TcPO2
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1 Indications:
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1.1 Pre and post ductal monitoring is used to document difference sin oxygenation
resulting fromright to left shunting at the level of the ductus arteriosus
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2 Equipment needed:
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3 Procedure:
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3.1. After stabilization of TcPO2 monitor, apply pre ductal Tc electrode
on right upper chest
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label monitor pre ductal.
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3.2 After stabilization of TcPO2 monitors, a
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3.2.1 Apply Tc electrode below umbilicus, label monitor for post
ductal assessment
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3.2.2 Apply TC electrode to the right shoulder area. lable for pre ductal
assessment
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3.3 Observe for differencez between pre and post ductal TCPO2.
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